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<h1 class="article-title" itemprop="name">Liquid 模板语言</h1>
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<p>LiquidJS 是一个简单的、安全的、兼容 Shopify 的、纯 JavaScript 编写的模板引擎。这个项目的目的是为 JavaScript 社区提供一个 Liquid 模板引擎的实现。Liquid 最初用 Ruby 实现并用于 Github Pages, Jekyll 和 Shopify,参考 <a href="./differences.html">和 Shopify/liquid 的区别</a></p>
<p>LiquidJS 语法相对简单。LiquidJS 中有两种标记:</p>
<ul>
<li><strong>标签</strong>。标签由标签名和参数构成,由 <code>{%</code><code>%&#125;</code> 包裹。</li>
<li><strong>输出</strong>。输出由一个值和一组可选的过滤器构成,由 <code>{{</code><code>&#125;&#125;</code> 包裹。</li>
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<blockquote class="note info"><strong class="note-title">在线示例</strong><p>在进一步了解细节之前,这里有一个在线示例:<a href="https://liquidjs.com/playground.html">https://liquidjs.com/playground.html</a></p>
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<h2 id="输出" class="article-heading"><a href="#输出" class="headerlink" title="输出"></a>输出<a class="article-anchor" href="#输出" aria-hidden="true"></a></h2><p><strong>输出</strong> 用于转换和输出变量到 HTML。下面的模板将会把 <code>username</code> 的值插入到 input 的 <code>value</code></p>
<pre class="line-numbers language-liquid" data-language="liquid"><code class="language-liquid"><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>input</span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>text<span class="token punctuation">"</span></span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>user<span class="token punctuation">"</span></span> <span class="token attr-name">value</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span><span class="token liquid language-liquid"><span class="token delimiter punctuation">&#123;&#123;</span>username<span class="token delimiter punctuation">&#125;&#125;</span></span><span class="token punctuation">"</span></span><span class="token punctuation">></span></span><span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre>
<p><em>输出</em> 里的值可以在输出之前经过若干个 <strong>过滤器</strong> 的转换。比如在变量后面追加一个字符串:</p>
<pre class="line-numbers language-liquid" data-language="liquid"><code class="language-liquid"><span class="token liquid language-liquid"><span class="token delimiter punctuation">&#123;&#123;</span> username <span class="token operator">|</span> <span class="token function filter">append</span><span class="token operator">:</span> <span class="token string">", welcome to LiquidJS!"</span> <span class="token delimiter punctuation">&#125;&#125;</span></span><span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre>
<p>过滤器可以级联,用起来像管道一样:</p>
<pre class="line-numbers language-liquid" data-language="liquid"><code class="language-liquid"><span class="token liquid language-liquid"><span class="token delimiter punctuation">&#123;&#123;</span> username <span class="token operator">|</span> <span class="token function filter">append</span><span class="token operator">:</span> <span class="token string">", welcome to LiquidJS!"</span> <span class="token operator">|</span> <span class="token function filter">capitalize</span> <span class="token delimiter punctuation">&#125;&#125;</span></span><span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre>
<p><a href="../filters/overview.html">这里</a> 是 LiquidJS 支持的完整的过滤器列表。</p>
<h2 id="标签" class="article-heading"><a href="#标签" class="headerlink" title="标签"></a>标签<a class="article-anchor" href="#标签" aria-hidden="true"></a></h2><p><strong>标签</strong> 用于控制模板渲染过程,操作模板变量,和其他模板交互等。例如 <code>assign</code> 可以用来定义一个模板中可以使用的变量:</p>
<pre class="line-numbers language-liquid" data-language="liquid"><code class="language-liquid"><span class="token liquid language-liquid"><span class="token delimiter punctuation">&#123;%</span> <span class="token keyword">assign</span> foo <span class="token operator">=</span> <span class="token string">"FOO"</span> <span class="token delimiter punctuation">%&#125;</span></span><span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre>
<p>一般标签成对地出现,一个开始标签和一个对应的结束标签,比如:</p>
<pre class="line-numbers language-liquid" data-language="liquid"><code class="language-liquid"><span class="token liquid language-liquid"><span class="token delimiter punctuation">&#123;%</span> <span class="token keyword">if</span> foo <span class="token operator">==</span> <span class="token string">"FOO"</span> <span class="token delimiter punctuation">%&#125;</span></span>
Variable `foo` equals "FOO"
<span class="token liquid language-liquid"><span class="token delimiter punctuation">&#123;%</span> <span class="token keyword">else</span> <span class="token delimiter punctuation">%&#125;</span></span>
Variable `foo` not equals "FOO"
<span class="token liquid language-liquid"><span class="token delimiter punctuation">&#123;%</span> <span class="token keyword">endif</span> <span class="token delimiter punctuation">%&#125;</span></span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<p><a href="../tags/overview.html">这里</a> 是 LiquidJS 支持的完整的标签列表。</p>
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